Great start, Cure-kun. Though I suggest that if you really like her, you should try your best to ask her out.
Something like 'Do you want to go to the movies sometime?' will be perfect. In fact, you can even show her your movie tickets. (Check that the tickets don't expire)
I think she'll get the hint.
^ Misaki-chan is right. The girl you like might really like you or she might've just been joking around.
...I've never seen Ai blush when she's close to Conan. Well, then again some girls blush when they get embarrassed or angry/mad/upset.
I wish you the best, Cure-kun. Make the right decisions.
Pyre, you know what happened yesterday afternoon. You can remove my name from the list of people who have crushes